Economical method for desulfurizing and dedusting glue gas produced during smelting of secondary lead

Abstract

The invention discloses an economical method for desulfurizing and dedusting glue gas produced during smelting of secondary lead. The economical method comprises the following steps of: adsorbing lead dust, SO2 and SO3 first by using slightly acidic water to separate from the CO2 by using the characteristic that the dissolution and adsorption capacity of the CO2 in a slightly acidic water solution is remarkably lower than that of the lead dust, the SO2 and the SO3; then removing the lead dust by using a precipitation or centrifugal mode; and finally adding lime to carry out sulfur fixation and desulfuration. According to the method disclosed by the invention, the consumption of a desulfurizer and the desulfurization cost are reduced, and a desulfurized product cannot be subjected to secondary pollution by the lead dust and can be recycled.

Description

1. Technical field [0001] The invention relates to an environmental protection process for secondary lead smelting, in particular to an economical method for desulfurization and dust removal of flue gas in secondary lead smelting. 2. Background technology [0002] In the recycling and smelting process of lead-acid batteries, due to the adsorption of a large amount of sulfuric acid in the plates and lead paste, in the smelting process of lead-containing waste, despite the desulfurization pretreatment, there is still a considerable amount of sulfur-containing substances that are difficult to remove. Entering smelting will inevitably produce a certain amount of SO 2 and SO 3 , this rich SO 2 and SO 3 If the flue gas is directly discharged into the atmosphere without desulfurization treatment, it will cause air pollution, form acid rain, and harm plants. If it is inhaled by people, obvious irritation symptoms will appear in the bronchi and lungs, causing coughing and damage t...

AI Technical Summary

Problems solved by technology

Both methods exist to spray alkaline liquid and SO 2 and SO 3 During reactive desulfurization, because the liquid is alkaline, it is easy to mix with a large amount of CO in the flue gas 2 The reaction occurs, which doubles the consumption of desulfurization agent, and the cost of desulfurization is huge, which is difficult to apply in actual smelting production

At the same time, although the smelting flue gas has been dedusted by multiple procedures such as gravity and bag type, the tail gas still contains lead dust exceeding the standard, and the lead dust content exceeds 1 mg / m3. Fine lead dust is removed by spraying and adsorption, but the removed lead dust is mixed with desulfurization products calcium sulfite and calcium sulfate and cannot be separated. The secondary pollution of lead dust in desulfurization products makes desulfurization products difficult to use. throw away everywhere

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